code: def __call__(self) -> Data:
      edge_index = torch.tensor(
          [
              [0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6, 7, 7, 8, 8, 9],
              [1, 0, 2, 1, 3, 2, 4, 3, 5, 4, 6, 5, 7, 6, 8, 7, 9, 8],
          ]
      )
      return Data(num_nodes=10, edge_index=edge_index)
  
file_path: pytorch_geometric/test/datasets/test_infection_dataset.py
imports: import torch
  from torch_geometric import seed_everything
  from torch_geometric.data import Data
  from torch_geometric.datasets import InfectionDataset
  from torch_geometric.datasets.graph_generator import ERGraph, GraphGenerator
label_desc: Use image node_id 1 for calling the DummyGraph obj's underlying member method code with example usage: obj.__call__() and returns: Data